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perf arm-spe: Update --switch-events docs in 'perf record' 

Update 'perf record' docs and ARM SPE recording options so that they are
consistent. This includes supporting the --no-switch-events flag in ARM
SPE as well.

Reviewed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: German Gomez <german.gomez@arm.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20211111133625.193568-3-german.gomez@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
German Gomez 2021-11-11 13:36:23 +00:00 committed by Arnaldo Carvalho de Melo
parent 9dc9855f18
commit 455c988225
2 changed files with 4 additions and 2 deletions
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2
tools/perf/Documentation/perf-record.txt
View File

@ -469,7 +469,7 @@ This option sets the time out limit. The default value is 500 ms.
--switch-events::
Record context switch events i.e. events of type PERF_RECORD_SWITCH or
PERF_RECORD_SWITCH_CPU_WIDE. In some cases (e.g. Intel PT or CoreSight)
PERF_RECORD_SWITCH_CPU_WIDE. In some cases (e.g. Intel PT, CoreSight or Arm SPE)
switch events will be enabled automatically, which can be suppressed by
by the option --no-switch-events.

4
tools/perf/arch/arm64/util/arm-spe.c
View File

@ -254,8 +254,10 @@ static int arm_spe_recording_options(struct auxtrace_record *itr,
if (!perf_cpu_map__empty(cpus)) {
evsel__set_sample_bit(tracking_evsel, TIME);
evsel__set_sample_bit(tracking_evsel, CPU);
/* also track task context switch */
tracking_evsel->core.attr.context_switch = 1;
if (!record_opts__no_switch_events(opts))
tracking_evsel->core.attr.context_switch = 1;
}
return 0;